Mineralogical characteristics of bentonites occurring in Ningcheng and Jianping area,China

作     者：GU JaRang MOON YongHee MOON HiSoo 

作者机构：Department of Earth System SciencesYonsei University Institute of Earth Atmosphere Astronomy BK21 Yonsei University 

出 版 物：《Science China Earth Sciences》 (中国科学（地球科学英文版）)

年 卷 期：2010年第53卷第4期

页      面：541-549页

核心收录：

学科分类：081803[工学-地质工程] 08[工学] 0818[工学-地质资源与地质工程] 

基　　金：conducted as a part of the Korea Science and Enginering Foundation (KOSEF) under contract F01-2005-000-10163-0 supported by Korea Science and Enginering Foundation (Grant No.F01-2005-000-10163-0) National Natural Science Foundation of China (Grant No.40272024) 

主　　题：montmorillonite beidellite expandability Greene-Kelly test trace element 

摘      要：This study is focused on the basic mineralogical and chemical characteristics of some selected samples from Jianping(JP) and Ningcheng(NC) area,*** were studied using X-ray diffraction(XRD),expandability,Greene-Kelly test,specific surface area,cation exchange capacity(CEC),differential thermal analysis(DTA),and chemical *** bulk samples consist of mainly montmorillonites along with appreciable amounts of cristobalite and with small amounts of quartz,feldspar and *** basal spacings of montmorillonites in all these examined samples show at about 1.5 nm,indicating that pre-dominant cations were *** crystallite thickness of the present sample lies from 0.449 to 0.710 nm(4.58-7.24 layers).As Greene-Kelly test,samples from Ningcheng area confirmed appreciable amount of beidellite component but samples from Jianping area did not contain anything about *** area of samples varies from 671 to 766 m2 g-1 depending on the amounts of *** CEC ranges from 70.30 to 82.75 meq 100g-1 in 2 μm size *** DTA curves are considered abnormal *** from Ningcheng area show relatively higher amount of SiO2 than those from Jianping area,possibly due to difference of parent rock *** element(Y,Nb,Ce and Zr) data are plotted on acidic to intermediate *** is apparent that no large chemical transfer would have been necessary during alteration.